7, rotels 4-5 mi, long, -chenes 
“nou mercined ~ith e 
nerroy wing 14, Re Macounii 
, Petals 1U-12 mm. long, achenes 
> narrowly margined 15. Re maxims 
le ke trichophvllus Chaix. ‘white ‘ater Crowfoote A slender submerged and 
rloating acuatics; stems commonly 1m, long; leaves submerged, alternate, on 
sheathing petioles .2-1,.5 cm. long, the blades 1-2 om, long, ternately 
dissected into slender, hair-like divisions, sometimes with a few floating 
lesvos 1-1,6 em. broac, reniform in outline, palmately 3-lobed, the lobes 
| 
again shallowly -toothed, 2 nresscd-pubescent; flowers flooting, solitary, 
opposite the uricr lecvess; sepals ovate, obtuse, 1,5-2.5 mm, longs netals 
-o rm, long, narrowly obovete, whitish, the nectar zit minute, not covered 
= -. 
vith s stale; reecitacle more or less hairys achenes 1.-14, forming a ¢lobose 
cluster v-G rm, in diameter, transversely rugose, plump, frequently hispidulous, | 
without « callous margin, the walls thin. 
Fre:ment in shalloy nools of slow moving streams or loke marfins or 
ee co & 
4. 
DONES, LHOCRSCCO fret or more, Ae acuatilis L., the wuronean recivrocel 
spocies, has bren found tt onec, in ‘ass. (Rhod. 3€: 50). Benson (Am, Jour, 
ov, 25: 176) recogmigcs this ~lant as Re acuctilis, however. 
a eee eT eee 
